Dynamo-electric machine.



Patented Mar. l2, |904.

' D. M. Buss.

DYNMO ELECTRIC MACHINE.

; l (Applimion med .my 9, 1990.)

(No Model.)

w mv wf l w m@ V W r .C .mw .mmm Q JI! P-@HIM ZZ//U/L/es-Sze z DONALD M. BLSS, OF LOWELL, MASSACHUSETTS, ASSGNOR TO THE NE/V ENGLAND MOTOR COMPANY, OF iVIASSAOlflUSE'l'l'S.

DYNAiVlO-ELECTRiC MACHN...

SPECIFICATION forming part of Letters Patent No. 669,575, dated March 12, 1901.

Application led July 9, 1900. serial No. 22.967. (No model.)

To all whom t may concern: the pole-shoes belonging to the cores of one Be it knownthatl, DONALD M, BLlss, a citipolarity are formed in a single piece of metal zen of Canada, residing in Lowell, county of or casting and the pole-shoes belonging to Middlesex, and State of Massachusetts, have the cores of opposite polarity are formed in invented an Improvement in Dynamo-Elecanother single casting. By this construction 55 tric Machines, of which the following descripthe pole-shoes of like polarity are connected tion, in connection with the accompanying together magnetically, and if any difference drawings, is a specification, like letters on the in magnetic flux is present in the poles of like drawings representing like parts. polarity it will tend to be equalized by lines of 1o The presentinvention relates to a dynamoforce flowing from the stronger to the weaker 6o electric machine, one object of the invention pole. The pole-slices may be in the form of being to simplify the construction of multiwings or projections connected together by polar machines, reducing the number of the a ring or annular connecting part, so that parts and rendering the fitting and assemwhen the said ring is placed parallel to the i5 bling of the parts easier 0f accomplishment. armature the projections will overlie the pole- 65 A fnrtherobject of the invention is to equalfaces to constitute the necessary pole-shoes. ize the magnetic field and to aord means for By turning the outer surface of the annuadjusting the pole-shoes ata single operation lar connecting parts and its projecting porwhen it is necessary to move the said poletions to a diameter equal to that of the poleshoes in one direction or the other with relafaces and boring the inner surface thereof to 7o tion to the armature. As heretofore comthe right diameter the pole-shoes will permonly constructed the field magnet poles fectly fit the pole-faces and will all be of equal have been provided with pole-shoes sepathickness. Furthermore,allofthe pole-shoes rately or individually attached thereto in vamay be adjusted at one operation by turning rious Ways, it being obvious that if it is dethe rings with which they are connected in 75 sired to change the position of the pole-shoes one direction or the other, if it is desired to With relation to the pole-pieces each pole-shoe have the pole-shoe project from the polar exinust be separately adjusted, it being further tremity more or less with relation to the didesirable that the several adjustments should rection of movement of the armature.

3o be the same, this being a matter of some dif- The rings carrying the pole-shoes may be 8o fieulty to accomplish. Furthermore, in moset on opposite sides ot' the machine, the tors in which the armature-Winding is arshoes of one polarity projecting inward from ranged with a number of parallel circuits or one side and the shoes of the other polarity groups it is necessary, in order to secure peralternating therewith and projecting inward fect operation under varying loads, not only from the other side, and the rings may be 85 that the severalgroups of coils in parallel on supported directly by the polar extremities the armature be balanced electrically, but and connected together, ifnecessary, by bolts also that the magnetic ux from each pole of non-magnetic material. should be equal in strength and amount. ln A. further feature of the invention consists 4o this case an unequal distribution of the flux in connecting with one of the rings a brush- 9o `around the armature tends to throw the arholding device, thus rendering the construcmature out of balance electrically, which retion of the machine asa whole extremely simsuits in defective operation and a reduced ple and the partsinterchangeablethroughout. output, and such unequal distribution of the Figure l isaside elevation of the field-magmagnetic flux into the armature from the sevnet frame of a machine embodying the in- 9 eral poles may be caused by imperfectjoints, vention, the armature being omitted to prevariation in section of the pole shoes or cores, vent confusion; and Fig. 2 is a vertical crossor a dierence in the length of the cores. section on the line to2 of Fig. l.

These objections are overcome in the machine The field-magnet frame A, which may be 5o embodying the present invention, in which of any suitable construction and arrangeloo ment, is provided with the inwardly-projecting pole-pieces A2,\vhich alternate in polarity. The faces of the several pole-pieces may be symmetrically shaped by boring or otherwise, so as to receive the pole-shoes b and @,which comprise wings or projections formed integral with annular supports b2 and c2, the outer surfaces of the projections being so shaped as to it the faces of the pole-pieces A2. Each of the annular supports is provided with half the number of projections needed, these projections being so spaced as to engage alternate polar extremities, so that the wings Z) will all lie in contact with polar extremities of one polarity and the wings o will all lie in contact with the polar extremities of the opposite polarity. Since these wings are arranged in this way, it is obvious that both the outer and inner surfaces thereof can be turned to the proper diameter so that the several wings will be equal in thickness and will also properly tit the pole-faces.

As best shown in Fig. 2, the supports h2 and c2 are placed on opposite sides of the machine, the shoes and annular supports being` heldin position by the polar extremities themselves. The said rings or annular supports are also shown as connected together by means of bolts d, of non-magnetic material, and are properly centered by means of shoulders adapted to engage the sides of the polepieces, two of the said shoulders being shown in Fig. 2 and indicated by the reference-ietter h3. rlhe pole-shoes are firmly held in position by the grip of the shoulders against the pole-pieces, but may be readily adjusted when the bolts are loosened. It is obvious, however, that any other suitable fastening means may be employed.

The brush-holding ring e, which is provided with brush-holders e2, may be advantageously connected with one of the annular supports, and is shown in Fig. 2as connected by means of bolts e3 with the support b2, which is provided with an annular channel bL to properly hold and center the brush-holder.

From the foregoing description it will be seen that while there is no magnetic connection between pole-shoes of opposite polarity the pole-shoes of like polarity are magnetically connected, and, furthermore, that the whole system of pole-shoes is embodied in a structure substantially independent of the rest of the machine and capable of adjustment as a whole with relation to the polepieces and armature.

It is not intended to limit the invention to the speciiic construction and arrangement shown and described7 since modifications may be made without departing from the invention.

I claiml. In a multipolar dynamo-electric machine, a field-magnet frame provided with radial polepieces; pole -shoes for said polepieces; and a pole-shoe ring or support having connected therewith all the pole-slices of like polarity, whereby said pole-shoes of like polarity are magnetically connected, as set forth.

2. In a multipolar dynamo-electric machine, a field-magnet frame provided with radial pole-pieces; pole-shoes for said polepieces; and a pole-shoe system comprising two annular supports,each provided with half of the pole-shoes required, the pole-shoes of one polarity being all connected with one of the said annular supports, andthe pole-shoes of the other polarity all being connected with the other annular support, as set forth.

3. In a multipolar dynamoelectric machine, the combination with the held-magnet frame provided with radial pole-pieces; of two annular supports at opposite sides of the field-m agnet frame, each of said supports having pole-shoes projecting inwardly therefrom to engage the faces of half the pole-pieces, the pole-shoes projecting inward from one support alternating with the pole-shoes projecting inward from the. other support, as set forth.

LL. In a multipolar dynamoelectric machine, a support having connected therewith all the pole-shoes of like polarity; and means for adjusting the said support and the said shoes with relation to the pole-pieces and armature, as set forth.

5. In a dynamo-electric machine, the combination with the pole-pieces; of pole-shoes therefor, the pole-shoes of like polarity heilig magnetically connected together; and means for non -magnetically connecting together pole-shoes of unlike polarity, the set of poleshoes being` an independentstructure adapted to be connected with the field-magnet frame, as set forth.

6. In a multipolar dynamo-electric machine, a support of magnetic material having connected therewith all the pole-shoes of like polarity; and a brush-holding ring connected with said support, as set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

DONALD M. BLISS.

Witnesses:

HENRY J. LIVERMORE, JAS. J. MALONEY.

IIO 

